[gnome-software] snap: Fix warning trying to adopt app without an ID

[Robert Ancell <rancell src gnome org>]

commit 02d335393c3bd95831d983a9a9438f3366bcc9d5
Author: Robert Ancell <robert ancell canonical com>
Date:   Thu Nov 28 12:50:27 2019 +1300

    snap: Fix warning trying to adopt app without an ID

 plugins/snap/gs-plugin-snap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/plugins/snap/gs-plugin-snap.c b/plugins/snap/gs-plugin-snap.c
index 64579310..ece07ae8 100644
--- a/plugins/snap/gs-plugin-snap.c
+++ b/plugins/snap/gs-plugin-snap.c
@@ -95,7 +95,7 @@ gs_plugin_adopt_app (GsPlugin *plugin, GsApp *app)
        if (gs_app_get_bundle_kind (app) == AS_BUNDLE_KIND_SNAP)
                gs_app_set_management_plugin (app, "snap");
 
-       if (g_str_has_prefix (gs_app_get_id (app), "io.snapcraft.")) {
+       if (gs_app_get_id (app) != NULL && g_str_has_prefix (gs_app_get_id (app), "io.snapcraft.")) {
                g_autofree gchar *name_and_id = NULL;
                gchar *divider, *snap_name;/*, *id;*/